Connecter, particularly for lamps having two filaments



Patentedl Oct. 8, 1935 i 1 luNi-rlsp 1 STATES t aoiasss CONNECTER, raa'rroumnnr ron mms HAVING 'rwo FILAMEN'IS James 'ritme Feux'` conti, rari, France `.Application September 29,' 1932, Serial No. 635,321'

l In France October 3,1931

mentsin parallel (maximum illumina two filaments in series (dimming) or cutting both out (extinguishing). The invention has for its object a switch which may be readily interposed between a socket having two contacts and the cap of va two filament lamp. This switch comprisesv a plug for engaging with the socket, this plug, provided with electric conductors, being connected to a sleeve provided with conducting blades and mounted on the cap of the two filament lam capable of angular movement relatively to the plug out of axial movement for obtaining the various conducting blades and the conductors of the plug 'and Vfor facilitating the v socket, which is effected by the temporary locking of the sleeve to the plug. t v

The -manner of carrying' the invention into effect will be readily understood from the followingdescription with reference to the accompanying drawing, whereim-f- Fig. 1 is a vertical section of the connecter constructed for mounting on a socket with a bayonet joint and Fig. 2 is a section on the line A--A of Figzl' Fig. 3 is a vertical section of the same connectar arranged for mounting on a screwed socket. f.

Figs. 4 and 5 show respectively in elevation and in plan the framework of the connecter shown in Fig. 1. f

y#Figs 6 and 'I show respectively a vertical section and a plan of a member of the connecter.

Figs. 8 and 9 show in elevation and in plan the cap of a lamp having two filaments for use in connection with the connecter.

Fig. 10, similar to Fig. 2, shows to a larger scale the contact blades and their connections to the' two filaments of the lamp.

As shown in Fig. 1 the connecter for direct application to a lamp is provided with a framework I of insulating material forming a plug of which the details are shown in Figs. 4 upper portion of this framework is `similar to the caps of lamps which fit into -ordinary sockets. At its lower end it has a notched collar 2. Two contacts 3 and 4 are respectively secured to metal cups 5 and 6 in which are adapted to turn freely two metal balls 'I and 3. t f

This sleeve is bothl The framework I iscovered by a sleeve 9 havinga rim which bears against the notched collar 2 of the framework. f y y y 'y A metal tube III, shown in Figs. 6 and 7is provided at its upper end with teethy IIcorresponding 5 with and adapted to engage with the notches of the collar 2 in' such a manner `as to form a temporary connection between the tube Ill and the framework I. l

At the bottom the tube III bayonet slots I2 adapted to receive the lamp. The tube I0 and the sleeve 9, which covers this tube, are connected together by a pin I3 which passes through the connecter.

I4 provided in 15 I5 of insulating material, loosely located I0, which is provided with three blade contacts I6, I1, and I8 adapted to give passage to the current supplied by the balls 1 and 8 (Fig. 2). Underneath the blades are provided 20 seatings adapted to receive coiled springs 29. These springs respectively bear against each of `the three blade contacts and are adapted to transmit the current to three contacts 2li, 2| and 22 (Figs. 8 and 9) provided on the cap of a 25 lamp having two filaments.

Referring to Fig. 8 it will be seen that the two pins 23 and 2l are of different sizes so as to avoid any error in mounting as regards the position of the three contacts on the caps of the lampshav- 30 ing two nlaments, whilst the slots I2 in the connecter are also of diierent sizes corresponding with the pins.

In the device described it will be seen that the sleeve 9 turn together around the 35 for fitting the it is ressential for the sleeve 9 and temporarily connected together. This result is obtained by the connectingv device. It is sufficient purpose to exert pressure on the sleeve 9 or the lampyso as to compress the three springs 29 and to'bring the teeth II of the tube I0 into engagement with the notches of the collar 2 of the' framework I. The disengagement is effected 45 automatically under the action of `the springs 29.

As will be seenjin Fig. 10, showing the washer I5 and the contact blades I6, I1 and I8 to alarger scale, the various blades are provided with diametrically opposite grooves a.-`-a', b-b, cc', 5o d.d, ee', the various diameters corresponding with two oppositely disposed grooves including between them an angle of 36.` These grooves are adapted to indicate the successive positions occupied by the balls which make the contacts. 55

a washer in the tube is provided with l0 It will also be seen that the edges at the adjacent faces of the blades I6 and I8 are bent upwardly and form the groove c' in such a manner that. when one ball rests between these edges it connects the blades I6 and I8 electrically in parallel.

The lamp being fitted in position in the connecter in the manner above described it is sumcient by acting either on the milled vportion I9 of the sleeve 9 or on the lamp ,itself to turn the connecting pin I3 which by turning the washer I5 produces in succession the following lighting conditions, commencing from the extinguished condition: Y c

a-a extinguished condition, b-b illumination of one filament, c-c' illumination ofboth filaments (the ball at c' bridging the two contact blades IG and I8), d-dillumination of the v second filament, e-e dimming (both-filaments being in series). v

Referring to Fig. 3 it will be seen that when the connecter is adapted to be fitted into a screwed socket, only the framework I is modified.

The notched collar 2 of the framework is in this case formed by a washer 25 suitably cut and held by a screw 26 under the framework. The cups 5 and 6 are respectively connected electrically to thescrew thread 21 and to the central contact 28.

I claim:-

An adapter for connecting atwo filament lamp havingthree contacts to a socket having two contacts, said adapter comprising a plug adapted to fit into said socket, two contacts in said plug, the contacts in said plug being adapted to cooperate with the contacts of said socket, a sleeve mounted for rotary and axial movement on said plug, an inner tube fixed to said sleeve, a washer loosely located in said tube, said washer having l` JAMES 'I'IBURCE FELIX CONTI. 

